If $A$ is any set, then
$A \cup A' = \phi $
$A \cup A' = U$
$A \cap A' = U$
None of these
If $U=\{a, b, c, d, e, f, g, h\},$ find the complements of the following sets:
$A=\{a, b, c\}$
Taking the set of natural numbers as the universal set, write down the complements of the following sets:
$\{ x:x$ is a prime number $\} $
Let $U = \{ 1,\,2,\,3,\,4,\,5,\,6,\,7,\,8,\,9,\,10\} $, $A = \{ 1,\,2,\,5\} ,\,B = \{ 6,\,7\} $, then $A \cap B'$ is
If $A$ and $B$ be any two sets, then $(A \cap B)'$ is equal to
Fill in the blanks to make each of the following a true statement :
$A \cup A^{\prime}=\ldots$